WikiQA [1]} is an open-domain corpus containing queries sampled from Bing logs. Based on the user clicks, the questions have been associated with a Wikipedia page (only the summaries were used).
We used the clean setting for which only questions having at least one good and one wrong answers are considered. The resulting corpus consists of 2,118 training, 126 development, and 243 test questions, with about 10 candidate answers per question on average.
We merged the dev. and test sets as they are too small to derive reliable results from each of them individually. Overall, we have 2117 questions and 20374 question/answer pairs.
